I'm exclusively a two-wheel traveler, but I come across a lot of interesting four-wheel vehicles on the road. They always make a fun photographic subject, collect 'em all. :)
Here are a few favorites from the US, Mexico, and Central America. There's a few classic Land Rovers and Land Cruisers in there too:
Click for large images, and let me know in the comments if you have any corrections or additions to the vehicle names!
Nevada fire-truck
Datsun120Y
Land Rover Series II
Volkswagen Baja Bug
